1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
andrew11 [14]
2 years ago
6

At the local playground, a 21-kg child sits on the right end of a horizontal teeter-totter, 1.8 m from the pivot point. On the l

eft side of the pivot an adult pushes straight down on the teeter-totter with a force of 151 N.In which direction does the teeter-totter rotate if the adult applies the force at a distance of 3.0 m from the pivot? (clockwise/ counterclockwise)

Physics
2 answers:
Novosadov [1.4K]2 years ago
8 0

The teeter-totter rotates counterclockwise

\texttt{ }

<h3>Further explanation</h3>

<em>Let's recall </em><em>Moment of Force</em><em> as follows:</em>

\boxed {\tau = F d }

<em>where:</em>

<em>τ = moment of force ( Nm )</em>

<em>F = magnitude of force ( N )</em>

<em>d = perpendicular distance between force and pivot ( m )</em>

Let us now tackle the problem !

<u>Given:</u>

mass of child = m_c = 21 kg

distance between pivot and child = d_c = 1.8 m

magnitude of force = F = 151 N

distance between force and pivot = d = 3.0 m

<u>Asked:</u>

direction of rotation = ?

<u>Solution:</u>

<em>Firstly , we will find </em><em>clockwise moment</em><em> by weight of the child:</em>

\tau_{clockwise} = w \times d_c

\tau_{clockwise} = mg \times d_c

\tau_{clockwise} = ( 21 \times 9.8 ) \times 1.8

\boxed{\tau_{clockwise} = 370.44 \texttt{ Nm}}

\texttt{ }

<em>Next, we will find </em><em>counterclockwise moment </em><em>by pushing force:</em>

\tau_{counterclockwise} = F \times d

\tau_{counterclockwise} = 151 \times 3.0

\boxed{\tau_{counterclockwise} = 453 \texttt{ Nm}}

\texttt{ }

<h3>Conclusion:</h3>

\tau_{counterclockwise} > \tau_{clockwise}

\texttt{The teeter-totter rotates \boxed{counterclockwise}}

\texttt{ }

<h3>Learn more</h3>
  • Impacts of Gravity : brainly.com/question/5330244
  • Effect of Earth’s Gravity on Objects : brainly.com/question/8844454
  • The Acceleration Due To Gravity : brainly.com/question/4189441
  • Newton's Law of Motion: brainly.com/question/10431582
  • Example of Newton's Law: brainly.com/question/498822

\texttt{ }

<h3>Answer details</h3>

Grade: High School

Subject: Physics

Chapter: Moment of Force

Alja [10]2 years ago
3 0

Answer:

Counterclockwise

Explanation:

We need to calculate the clocwkise and the counterclockwise torque.

The clockwise torque is the one generated by the child sitting on the right. This torque is given by:

M_C = F d

where

F=mg=(21 kg)(9.8 m/s^2)=205.8 N is the force exerted by the child (his weight)

d = 1.8 m is the distance from the pivot point

So, the clockwise torque is

M_C = (205.8 N)(1.8 m)=370.4 Nm

The counterclockwise torque is the one generated by the adult pushing on the left, and it is given by

M_A = F d

where

F = 151 N is the force applied

d = 3.0 m is the distance from the pivot

Substituting,

M_A = (151 N)(3.0 m)=453 Nm

So, the net torque is

M_A - M_C = 453 Nm - 370.4 Nm=82.6 Nm

And since the counterclockwise momentum is greater than the clockwise one, the teeter-totter will rotate counterclockwise.

You might be interested in
Who’s has bigger cross sectional area capillaries or aorta?
Natalka [10]

Answer:

Even though the cross-sectional area of each capillary is extremely small compared to that of the large aorta, the total cross-sectional area of all the capillaries added together is about 1,300 times greater than the cross-sectional area of the aorta because there are so many capillaries

Explanation:

8 0
3 years ago
You are trying to find the amount of heat transferred between two substances. In order to do this, you plan
Zarrin [17]

Answer:

do you have kids ?

Explanation:

i am a 14 year old girl

7 0
2 years ago
Voices of swimmers at a pool travel 400 m/s through the air and 1,600 m/s underwater. The wavelength changes from 2 m in the air
frosja888 [35]

The frequency of the wave has not changed.

In fact, the frequency of a wave is given by:

f=\frac{v}{\lambda}

where v is the wave's speed and \lambda is the wavelength.

Applying the formula:

- In air, the frequency of the wave is:

f=\frac{400 m/s}{2 m}=200 Hz

- underwater, the frequency of the wave is:

f=\frac{1600 m/s}{8 m}=200 Hz

So, the frequency has not changed.

3 0
3 years ago
Read 2 more answers
A mixture in which the parts can be seen separately from the other parts is considered to be what type of mixture
serious [3.7K]

Answer: A mixture is a combination of two or more substances (elements or compounds) which is not done chemically. Mixtures are two types Homogeneous Mixtures and Heterogeneous mixtures.

6 0
2 years ago
Cart a having a mass of 150 kg initially moving to the right at a speed of 8 m/s collides with cart b with a mass of 150 kg, ini
kakasveta [241]

The speed of cart b is 6m/s while the total momentum of the systmen is 4200 kg m/s

<h3>Conservation of Linear Momentum</h3>

Given Data

  • Mass of cart one M1  = 150kg
  • Initial Velocity U1 = 8m/s
  • Final VelocityV1 = 5 m/s

Mass of cart two M2  = 150kg

Velocity U2 = 6m/s

Applying the principle of conservation of linear momentum we have

M1U1+M2U2 = M1V1+ M2V2

a. what is the speed of cart b after collision

substituting our given data we have

150*8+ 150*6 = 150*5+150*V2

1200 + 900 = 1200+ 150V2

2100 - 1200 = 150V2

900 = 150V2

Divide both sides by 150

V2 = 900/150

V2 = 6m/s

b. what is the total momentum of the system before and after collision

Total Momentum in the system is

Total momentum = Momentum before Impact+ Momentum after Impact

Total momentum = M1U1+M2U2 + M1V1+ M2V2

Total momentum = 1200 + 900 + 1200+ 900

Total momentum = 4200 kg m/s

Learn more about Conservation of Linear Momentum here:

brainly.com/question/7538238

6 0
2 years ago
Other questions:
  • A newly discovered planet has a mean radius of 7380 km. A vehicle on the planet\'s surface is moving in the same direction as th
    8·1 answer
  • The earth revolves around the sun in the counterclockwise direction, completing one full revolution about every 365 days. In rea
    14·1 answer
  • Tech A says that an overdrive gear ratio means the input gear turns faster than the output gear. Tech B says that overdrive rati
    7·1 answer
  • What dose it mean to say that mass is conserved during a physical change
    6·2 answers
  • What is the speed of sound in air at 50°F (in ft/s)?
    7·1 answer
  • Which hypothesis could be used in a scientific experiment and possibly lead to more hypotheses and experimentation? If the amoun
    8·2 answers
  • Interior crocodile alligator i drive a chevrolet movie theater​
    7·2 answers
  • PLZZZ HELP!!!<br><br><br> State the forces in a spring, magnets, electric scales, and a newton metre
    12·1 answer
  • Heyy! i’ll give brainliest please help
    5·2 answers
  • Does the world have a responsibility to assist t millions of people in a country that does not provide for their needs?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!